Copper-lime dust



' Patented Nlar. 8,1921.

, UNITED STATES PATENT OFFICE.

GEORGE E. SANDERS, OF DELORO; ONTARIO, CANADA, ASSIGNOR TO BITCHES, PIVER & CO., A CORPORATION OF NEW JERSEY. v

. cornea- IME DUST.

. No Drawing. Original application filed necember 23, 1920, Serial No. 432,692," Patent No. 1,541,753.

Divided and this application filed August 9,1924. Serial No. 731,202.

This application is a division of my co- 7 pending application filed Dec. 23, 1920, Ser.

No.. 432,6 2 and now issued Patent 'No. 1,541,753, ated. June 9, 1925.

5 The dbject of this invention 'iS. to produce a dry powder suitable for dustmg on fol1age as a fungicide or a combinedfungiclde and insecticide. r

Copper is a recognized basis for a fungi- 10 cide, being used in yarious forms, such as copper hydroxide, copper sulphate, copper car onate, etc. Other metals such 'as nickel, cobalt, silver, zinc and, to a lesser extent, aluminum, are also known to possess fungicidal properties.

, J Dusting or the application of a funglclde in powdered form possesses numerous ad vantages over liquid spraying and 1s more efiicient.

I prefer to. use copper-sulphate, although other salts of copper, or a salt of other metals having fungicidalvalue, such as nickel, may

- be used. f

In addition to the cost of the former types of dust being much higher than the one that I will herein describe, the former types of dust lack flexibility. In other words, in the f dried and milled Bordeaux owder a moderate or' a high degree of. e ectiveness can be attained by proper-manipulation of the in edients but they can not be made as high y active as a freshly made Bordeaux. The dust herein described not only has the advantage of much lower cost than the dusts heretofore used but the form of the final copper salt obtained can be varied by slight manipulation from .the most active to the most inert form, as desired, for use on different types of foliage or disease.

My rocedure is as follows: Quic lime, in either powdered, granulated, crushed or lum' 'form, is placed m a mixer or hydrator. ufiicient water is added so that it, together with the water of crystallization in the copper sulphate, is enough, to hydratethe lime.

While the-lime is hydrating or slaking, copper sulphate is added to it in the mixer. If the cop r sulphate is added after the hydrating ime has begun to cool and the batch agitated or stirred for a'short time and then dumped on a. cooling floor before tt tt Whl t will have a blue. color when of fungus.

.jectin present application, the action of the many desired the resulting dust will be almost-- tures present during the hydrating of the lime and adding the salt either in solution or as crystals, or merely grinding the crystals with the quicklime or partially hydrated lime, any type of copper salt, from monohydrated .fcopper sulphate, brown copper hydroxide or copper oxide may be '-made, with as many degrees of safety to foliage and equal variations in activity in the control I prefer to use quicklime, but barium .or magnesium oxide may be substituted. I prefer -fine crystal copper sulphate, but medium or coarse crystals or a solution of the same can be used, depending on the product desired. Salts of nickel, aluminum,

cobalt, zinc, silver, etc.-, may be substituted or the copper, and carbonates, acetates or other salts may be substituted for the sulphate formdesired, an arsenical insecticide, such as lead If a combined fungicide and insecticide is I arsenate, calcium arsenate, zinc arsenate,

Paris green, etc. ma

be added or mixed with the dust either fore or after grinding. h e dry powder formed may be used direct or ground ina suitable mill in order "to secure a desired stage of fine division.

The form ofdry powdered product produced by this process is much more effective than a mixture of dehydrated copper sulphate which has been dehydrated by subwith ydrated lime, in the usual manner. In the process forming the subject of the I, onohydrated form, of theldehydrated to artificial heat "and then mixed copper sulphate, mixed with hydrated quick lime, as this. product is very efficient as a' fungicide'andis adapted foruse on many varieties of pl'a nt foliage for the control of fungus diseases.

Whatl Claim and desire to "secure by Letters Patent is 1.'A method of which comprises the bringing together of quick lime, water and a hydrated copper salt in crystal form, the copper salt being added While the limeis hydrating and the amount of water being controlled to cause the coplime, to produce a dry powdered product.

per salt to be dehydrated to a predetermined degree by the action of the hydrating v 2. A method of producing a fungicide which comprises'the bringing together of quick'lime, water and a hydrated metallic salt having a fungicidal value, \the' saltbeing added While the lime is-hydrating and the amount of water being controlled to cause'the salt to be dehydrated to a predetermined degree by the action of the hydrat- .ing lime, to. produce a dry powdered product.

3. A method of producing a fungicide sulphate in crystal form, the copper sulproducing a fungicide which comprises the bringing-together of I quick lime, water and polyhydrated copper phate being added while thelime is hydrating and the amount of Water being controlled to cause the copper sulphate to be clehydrat ej to the monohydrated form by the action of the hydrating lime and proby grinding together copper sulphate crystals and vquicklime. I

A dry powder suitable for dusting, v composed of a metallic salt having fungicidal value Which has been dehydrated to apredetermined degree by the action of hydrating quick lime thereon, and the simultaneouslyproduced hydrated lime.

Signed at Medina, in thecounty of Orleans, State of New York this .6th day of August A. I). 1924.

, GEORGE E. SANDERS.

dating the product in a dry powdered form. 

